Improvement in punching-machines



H. BLUNDELL. Punching-Machine.

No. 212,535. Patented Feb. 25,1879.

UNITED 'raras PATENT Orr-ron HENRY BLUNDELIJ, OF PROVIDENCE, RHODE ISLAND.

IMPROVEMENT IN PUNCHlNG-IVIACHINES.

Specification forming part of Letters Patent No. 212,535, dated February 25, 1879; application filed December 17, 1877.

To all whom it may concern:

Be it known that I, HENRY BLUNDELL, of the city and county of Providence, and State of Rhode Island, have invented new and useful Improvements in Punches; and l hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and the letters of reference marked thereon, being a part of this specification. t

This invention relates to improvements in punchin g-machiues for leather and sheet Inetal, &c., where a series of punches are attached to one bar and all are moved by means of a treadle and toggle-levers, which will be more fully hereinafter described, and set forth in the claims.

Figure l represents a punching-machine, in which a number of punches are operated simultaneously by means of a foot-treadle hinged at the rear of the frame, and which, with the lower toggle-bar, is made in one piece, and thus while a great throw is given to the punches, which are raised a considerable distance to allow of the insertion and adjustment of the material to be punched, great power is exerted in the act of punching. Fig. 2 is a sectional view of one punch, shown in contact with the material to be punched. Fig. 3 is a sectional view of the same punch, shown in the position when passing through the material and partially rotated. Fig. 4 is a modification ofthe punch, shown enlarged. Fig.` 5 is a view of the sleeve provided with the curved slots, by which rotation is imparted to the punch.

Similar letters of reference indicate corresponding parts.

In the drawings, a represents the-'punch proper, made in the usual manner, slightly tapering, with a iiat or'slightly-coneaved end and smooth cutting-edge, such as is usual in punches for cutting holes into paper, leather, textile or other yielding material, as also into metal plates. b is the socket in which the punch is secured. ,c is a sleeve, which is provided with curved slots, in which a pin or pins slide, so as to give a partial rotation to the punch. This sleeve may be secured to the punch and the pin or pins to the stationary frame,

in which the punch is free to partially turn and reciprocate; or the sleeve may be fixed, and the pin or pins secured to the punch or punch-socket. Z is an adjusting-screw, by which the punch can be readily adjusted. e is a coiled spring, pressing against the punch, and allowing the same to yield to the pressure, and thus partially rotate by means of the curved slots in the sleeve c.

f is a table, and f f' the standards by which the table is supported. g is a bracket, secured to the table and supporting the slide h, in which a reciprocating rod slides, to the lower' end of which the cross-bar i is secured, in which the punches (shown enlarged in Figs. 2, 3, 4, and 5) are secured. j is a raised punchbar, onwhich the punches act, and on which the material to be punched is laid. 7c is a hinged lever, connected yat Z with the verti cally-reciprocating bar to which the punchhead or cross-bar 'i is secured, and at the other end with the toggle-jointed lever m. 'n is the lower toggle-jointed lever, made in one piece with the foot-lever n', and hinged to the frame. It is provided with the foot-plate 0. p is a coiled tension-spring, by which the lever n is raised when the pressure is released and the punches withdrawn.

The operation of the machine is as follows: A corset into which holes are to be punched for the insertion of eyelets, a piece of leather to be punched for receiving the rivets in making hose, or any other material into which a number of holes are to be punched, is laid on the table and adjusted on the punch-bar j. The treadle o is depressed by the foot of the operative, when, by means of the hinged lever n, n', fm, and 7c, the cross-bar t, carrying the punches, is pressed on the material until the pressure exceeds the resistance ot the springs c e, when the several punches will automatically adjust themselves to any variation of thickness in the material to be punched. The toggle-jointed levers m n will now be nearly on a line, and

their leverage, with a slight pressure at 0, will claim as neur and desire to secure by Letters Patentl. The combination, with the punchl c, arranged to yield and partially rotate, of the spring c and adjusting-screw d, by which the resistance of the punch can be adjusted, sub stantially as .and for the purpose set fort-h.

2. In a performing-machine, the combination ofthe punch-carrier z', operated, substantially as described, by means of the toggle-levers and slides, with the series of punches, each havin g its spring c adjustable by means of a vertical setscrew, whereby the different resistances along the material are compensated, substantially as and for the purpose described.

3. In a multiple pertbratillg-machine, the combination, with the table f, of the punchbar j, the bracket g, slide h, and reciprocating punch-carrier t', arranged and operating substantially as and for the purpose described. HENRY BLUNDELL. Witnesses: v

JOSEPH A. MILLER, JOSEPH A. MILLER, Jr. 

